Everyone loves puzzles, right? This math puzzle from the YouTuber Numberphile poses a simple question: How can a mouse escape from a cat. But wait! It's not just a mouse running on the ground. Instead ...

DEAR JOAN: Squirrels and cats do the math. Watching squirrels and cats prepare to, and then make remarkable leaps, is one of my favorite things. The squirrels hesitate, wag their tails, take a ...